US9496676B2 - Optical amplifier and control method thereof - Google Patents

Optical amplifier and control method thereof Download PDF

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US9496676B2
US9496676B2 US14/776,030 US201414776030A US9496676B2 US 9496676 B2 US9496676 B2 US 9496676B2 US 201414776030 A US201414776030 A US 201414776030A US 9496676 B2 US9496676 B2 US 9496676B2
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pumping laser
current control
excitation light
current
laser diode
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US20160028209A1 (en
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Motoyoshi Kawai
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NEC Corp
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NEC Corp
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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
    • H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
    • H01S3/10—Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating
    • H01S3/13—Stabilisation of laser output parameters, e.g. frequency or amplitude
    • H01S3/1301—Stabilisation of laser output parameters, e.g. frequency or amplitude in optical amplifiers
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
    • H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
    • H01S3/05—Construction or shape of optical resonators; Accommodation of active medium therein; Shape of active medium
    • H01S3/06—Construction or shape of active medium
    • H01S3/063—Waveguide lasers, i.e. whereby the dimensions of the waveguide are of the order of the light wavelength
    • H01S3/067—Fibre lasers
    • H01S3/06754—Fibre amplifiers
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
    • H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
    • H01S3/09—Processes or apparatus for excitation, e.g. pumping
    • H01S3/091—Processes or apparatus for excitation, e.g. pumping using optical pumping
    • H01S3/094—Processes or apparatus for excitation, e.g. pumping using optical pumping by coherent light
    • H01S3/094061—Shared pump, i.e. pump light of a single pump source is used to pump plural gain media in parallel
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
    • H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
    • H01S3/09—Processes or apparatus for excitation, e.g. pumping
    • H01S3/091—Processes or apparatus for excitation, e.g. pumping using optical pumping
    • H01S3/094—Processes or apparatus for excitation, e.g. pumping using optical pumping by coherent light
    • H01S3/09408—Pump redundancy
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
    • H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
    • H01S3/09—Processes or apparatus for excitation, e.g. pumping
    • H01S3/091—Processes or apparatus for excitation, e.g. pumping using optical pumping
    • H01S3/094—Processes or apparatus for excitation, e.g. pumping using optical pumping by coherent light
    • H01S3/0941—Processes or apparatus for excitation, e.g. pumping using optical pumping by coherent light of a laser diode
    • H01S3/09415—Processes or apparatus for excitation, e.g. pumping using optical pumping by coherent light of a laser diode the pumping beam being parallel to the lasing mode of the pumped medium, e.g. end-pumping
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
    • H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
    • H01S3/10—Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating
    • H01S3/13—Stabilisation of laser output parameters, e.g. frequency or amplitude
    • H01S3/1301—Stabilisation of laser output parameters, e.g. frequency or amplitude in optical amplifiers
    • H01S3/13013—Stabilisation of laser output parameters, e.g. frequency or amplitude in optical amplifiers by controlling the optical pumping
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
    • H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
    • H01S3/09—Processes or apparatus for excitation, e.g. pumping
    • H01S3/091—Processes or apparatus for excitation, e.g. pumping using optical pumping
    • H01S3/094—Processes or apparatus for excitation, e.g. pumping using optical pumping by coherent light
    • H01S3/094096—Multi-wavelength pumping
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
    • H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
    • H01S3/23—Arrangements of two or more lasers not provided for in groups H01S3/02 - H01S3/22, e.g. tandem arrangements of separate active media
    • H01S3/2383—Parallel arrangements
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
    • H01S5/00—Semiconductor lasers
    • H01S5/40—Arrangement of two or more semiconductor lasers, not provided for in groups H01S5/02 - H01S5/30
    • H01S5/4018—Lasers electrically in series

Definitions

  • the present invention relates to an optical amplifier for use in an optical communication system and a control method of the optical amplifier, and in particular to an excitation light module incorporated in the optical amplifier.
  • an optical communication system In recent years, domestic and international communication volume has sharply increased, and long-distance transmission is carried out by an optical communication system mainly.
  • an optical amplifier in each of transponders provided in the optical transmission path at predetermined intervals amplifies signal light that has attenuated through the transmission path.
  • optical amplifier in the transponder of a popular optical communication system will be described in details, referring to a drawing.
  • FIG. 3 is a block diagram showing an example of the optical amplifier of the transponder in the optical communication system.
  • the optical amplifier amplifies the optical signal of two transmission paths, which are a transmission line A and a transmission line B.
  • Each of the transponders in the optical communication system includes at most eight optical amplifiers inside an air-tight housing.
  • the optical amplifier 10 in FIG. 3 includes an erbium-doped optical fiber (EDF) 9 for each of the transmission line A and the transmission line B, and excitation light source modules 4 and 5 that oscillate excitation light.
  • the optical amplifier 10 also includes a control circuit 7 that controls the excitation light source modules 4 and 5 , an optical coupler 6 that synthesizes the excitation lights from the two modules and splits the excitation light into two beams at a predetermined ratio, and a wavelength division multiplexing (WDM) coupler 8 that couples the excitation light and the signal light and provides the coupled light to the EDF 9 .
  • WDM wavelength division multiplexing
  • the excitation light source module 4 includes a 974 nm pumping laser diode 1 that employs InGaAs/GaAs, and a monitoring photodiode 3 .
  • the excitation light source module 5 includes a 976 nm pumping laser diode 2 that employs InGaAs/GaAs, and a monitoring photodiode 3 .
  • the optical amplifier 10 couples and splits the excitation lights from the two excitation light source modules with the optical coupler 6 , so as to provide the excitation light of the same level to the respective EDFs 9 in the transmission line A and the transmission line B.
  • the optical amplifier 10 also includes the control circuit 7 that controls the monitoring photodiode 3 provided in the excitation light source module so as to maintain the output at a constant level. Therefore, fluctuation of the excitation light level can be suppressed, despite temporal fluctuation of ambient temperature and the pumping laser diode element.
  • PTL Patent Literatures 1 and 2.
  • the optical amplifier according to PTL 1 prevents the life span of an excitation light source from being shortened, and controls the excitation light source so as to output the excitation light at a constant level, thus improving the reliability.
  • PTL 2 discloses an optical amplifier having a redundant configuration including a plurality of excitation light sources, which are connected in series so as to reduce the drive current.
  • a reserve pumping laser diode connected in parallel is activated in case that the excitation light from the pumping laser diode declines or the pumping laser diode stops the output, to compensate the excitation light level.
  • the drive current is increased so as to compensate the excitation light level. Therefore, the power consumption is increased.
  • the present invention provides an optical amplifier and a control method of the optical amplifier capable of maintaining the excitation light level without increasing power supply in case that a pumping laser diode currently in use is degraded.
  • the present invention provides an optical amplifier including a plurality of pumping laser diodes that each oscillate excitation light to be inputted to an optical fiber amplifier, a first current control element that controls a current flowing through the plurality of pumping laser diodes, a second current control element that controls a current flowing through at least one of the pumping laser diodes, and a control circuit that controls the first current control element and the second current control element.
  • the present invention provides an optical amplifier control method including coupling respective outputs from a plurality of pumping laser diodes that each oscillate excitation light and inputting the coupled output to an optical fiber amplifier, supplying a drive current in series to the plurality of pumping laser diodes, detecting an output of one of the plurality of pumping laser diodes, and controlling an amount of current that bypasses through other pumping laser diodes out of the drive current, on a basis of the output.
  • the optical amplifier and the control method thereof according to the present invention suppress an increase in power consumption (current consumption) despite activating a reserve pumping laser diode in case that a pumping laser diode currently in use is degraded or has failed.
  • FIG. 1 is a block diagram showing an optical amplifier of a transponder in an optical communication system according to a first exemplary embodiment of the present invention.
  • FIG. 2 is a block diagram showing an optical amplifier of a transponder in an optical communication system according to a second exemplary embodiment of the present invention.
  • FIG. 3 is a block diagram showing an optical amplifier of a transponder in an optical communication system according to a related art.
  • FIG. 1 is a block diagram showing an example of an optical amplifier of a transponder in an optical communication system according to a first exemplary embodiment of the present invention.
  • the optical amplifier amplifies the optical signal of two transmission paths, which are a transmission line A and a transmission line B.
  • the optical amplifier of the transponder in the optical communication system includes an erbium-doped optical fiber (EDF) 9 provided in each of the transmission line A and the transmission line B.
  • the optical amplifier also includes excitation light source modules 4 and 5 , a reserve excitation light source module 12 , a first current control element 13 , a second current control element 14 , a control circuit 7 , a polarization beam combiner 15 , an optical coupler 6 , and a wavelength division multiplexing (WDM) coupler 8 .
  • WDM wavelength division multiplexing
  • the excitation light source module 4 includes a 974 nm pumping laser diode 1 that employs InGaAs/GaAs, and a monitoring photodiode 3 .
  • the excitation light source module 5 includes a 976 nm pumping laser diode 2 that employs InGaAs/GaAs, and a monitoring photodiode 3 .
  • the reserve excitation light source module 12 includes a reserve 974 nm pumping laser diode 11 that employs InGaAs/GaAs, and a monitoring photodiode 3 .
  • the excitation light source module 4 , the excitation light source module 5 , and the reserve excitation light source module 12 are connected in series.
  • the first current control element 13 is connected in series to the pumping laser diode 1 , the pumping laser diode 2 , and the reserve pumping laser diode 11 .
  • the second current control element 14 is connected in parallel to the reserve pumping laser diode 11 .
  • the first current control element 13 and the second current control element 14 are each controlled by the control circuit 7 so as to adjust the current flowing through the pumping laser diodes 1 and 2 , and the reserve pumping laser diode 11 .
  • the polarization beam combiner 15 controls the polarization of the excitation light from the pumping laser diode 1 and the pumping laser diode 2 and couples the excitation light into one beam.
  • the optical coupler 6 then synthesizes the coupled excitation light and the excitation light of the reserve pumping laser diode 11 , and splits into two beams at a predetermined ratio.
  • the WDM coupler 8 couples the excitation light and the signal light, and provides the coupled light to the EDF 9 .
  • the monitoring photodiode 3 detects the excitation light from the pumping laser diodes 1 and 2 and the reserve pumping laser diode 11 , and outputs a signal corresponding to the detected excitation light to the control circuit 7 .
  • the control circuit 7 receives the detection signal outputted by the monitoring photodiode 3 , and adjust the current flowing through the first current control element 13 and the second current control element 14 .
  • the control circuit 7 controls the first current control element 13 so as to supply a current of an initial value to the pumping laser diode 1 and the pumping laser diode 2 which are connected in series.
  • the control circuit 7 also controls the second current control element 14 so as not to supply a current to the reserve pumping laser diode 11 connected to the pumping laser diodes 1 and 2 .
  • the initial value of the current supplied to the pumping laser diode 1 and the pumping laser diode 2 is approximately 90% to 95% of a maximum value of the current that can be supplied to the first current control element 13 .
  • the entirety of the initial current is supplied to the second current control element 14 connected in parallel to the reserve pumping laser diode 11 .
  • the control circuit 7 controls the second current control element 14 so as to supply a current of a value not exceeding the current value flowing through the first current control element 13 , to the reserve pumping laser diode 11 connected in parallel to the second current control element 14 .
  • the current supplied to the second current control element 14 is supplied to the reserve pumping laser diode 11 , and therefore the current flowing through the pumping laser diodes 1 and 2 and the reserve pumping laser diode 11 which are connected in series is not increased.
  • the excitation light from the reserve pumping laser diode 11 is distributed to the respective EDFs 9 of the transmission line A and the transmission line B, via the optical coupler 6 and the WDM coupler 8 .
  • the excitation light level can be maintained constant.
  • the control circuit 7 controls the first current control element 13 to supply a current of a maximum value, and controls the second current control element 14 so as not to supply a current. Accordingly, the first current control element 13 supplies the current to the reserve pumping laser diode 11 . Since the reserve pumping laser diode 11 is connected in series to the first current control element 13 and the pumping laser diodes 1 and 2 , the current flowing therethrough is not increased. Thus, the current consumption can be maintained constant, despite the reserve pumping laser diode being activated.
  • the excitation light of the reserve pumping laser diode 11 serves to compensate the excitation light the output of which has been stopped owing to malfunction or the like, the level of the excitation light distributed to the respective EDFs 9 of the transmission line A and the transmission line B declines to 50% of the level before the malfunction, at maximum.
  • FIG. 2 is a block diagram showing an optical amplifier of a transponder in an optical communication system according to a second exemplary embodiment of the present invention.
  • the optical amplifier of the transponder according to the second exemplary embodiment further includes a reserve excitation light source module 17 , another second current control element 14 , and another polarization beam combiner 15 , in addition to the configuration according to the first exemplary embodiment.
  • the reserve excitation light source module 17 includes a reserve 976 nm pumping laser diode 16 that employs InGaAs/GaAs, and a monitoring photodiode 3 .
  • the reserve pumping laser diode 16 is connected in series to the first current control element 13 , the pumping laser diode 1 , the pumping laser diode 2 , and the reserve pumping laser diode 11 .
  • the second current control element 14 is connected in parallel to the reserve pumping laser diode 16 .
  • the polarization beam combiner 15 couples the polarized excitation light of the reserve pumping laser diode 11 and the reserve pumping laser diode 16 into one beam.
  • the optical coupler 6 then synthesizes the coupled excitation light and the coupled excitation light of the pumping laser diodes 1 and 2 , and splits into two beams at a predetermined ratio.
  • the control circuit 7 controls the first current control element 13 so as to supply a current of a predetermined value to the pumping laser diode 1 and the pumping laser diode 2 which are connected in series.
  • the control circuit 7 also controls the second current control element 14 so as not to supply a current to the reserve pumping laser diode 11 and the reserve pumping laser diode 16 .
  • the initial value of the current supplied to the pumping laser diode 1 and the pumping laser diode 2 is approximately 90% to 95% of a maximum value of the current that can be supplied to the first current control element 13 .
  • the entirety of the initial current is supplied to the second current control element 14 connected in parallel to the reserve pumping laser diodes 11 and 16 .
  • the control circuit 7 controls the second current control element 14 so as to supply a current of a value not exceeding the current value flowing through the first current control element 13 , to the reserve pumping laser diode 11 or the reserve pumping laser diode 16 .
  • the current supplied to the second current control element 14 is supplied to the reserve pumping laser diode 11 or the reserve pumping laser diode 16 , and therefore the current flowing through the pumping laser diodes 1 and 2 , the reserve pumping laser diode 11 , and the reserve pumping laser diode 16 which are connected in series is not increased. Further continuing the description of the operation, the excitation light from the reserve pumping laser diode 11 and the reserve pumping laser diode 16 is distributed to the respective EDFs 9 of the transmission line A and the transmission line B, via the polarization beam combiner 15 , the optical coupler 6 and the WDM coupler 8 . Thus, the excitation light level can be maintained constant.
  • the decline of the excitation light level is compensated with the pumping laser diode of the same wavelength, and therefore the profile shape of the light outputted by the EDF can be maintained. Accordingly, the gain of the EDF, which depends on the wavelength, can be maintained. In practical use where the transponders in the optical communication system are connected in multiple stages, the cumulative profile shape of the light outputted by the EDF can also be maintained, and thus the gain of the EDF can be maintained.
  • the control circuit 7 controls the first current control element 13 to supply a current of a maximum value, and controls the second current control element 14 so as not to supply a current. Accordingly, the first current control element 13 supplies the current to the reserve pumping laser diode 11 and the reserve pumping laser diode 16 . Since the reserve pumping laser diode 11 and the reserve pumping laser diode 16 are connected in series to the first current control element 13 and the pumping laser diodes 1 and 2 , the current flowing therethrough is not increased.
  • the excitation light of the reserve pumping laser diodes 11 and 16 serves to compensate the decline of the level of the excitation light from the pumping laser diodes 1 and 2 , and therefore the level of the excitation light distributed to the respective EDFs 9 of the transmission line A and the transmission line B can be maintained constant.
  • the profile shape of the light outputted by the EDF can be maintained.
  • the optical amplifier according to the present invention is configured to activate the reserve pumping laser diode connected in series to the pumping laser diode in case that the excitation light level of the pumping laser diode has declined or the output of the excitation light has stopped, and therefore the level of the excitation light can be maintained, and the increase of current consumption can be suppressed.

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  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Engineering & Computer Science (AREA)
  • Plasma & Fusion (AREA)
  • Optics & Photonics (AREA)
  • Lasers (AREA)
  • Optical Communication System (AREA)
US14/776,030 2013-03-15 2014-03-11 Optical amplifier and control method thereof Active US9496676B2 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
JP2013053439 2013-03-15
JP2013-053439 2013-03-15
PCT/JP2014/001351 WO2014141684A1 (ja) 2013-03-15 2014-03-11 光増幅器およびその制御方法

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US9496676B2 true US9496676B2 (en) 2016-11-15

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US (1) US9496676B2 (de)
EP (1) EP2975705A4 (de)
JP (1) JPWO2014141684A1 (de)
CN (1) CN105051990B (de)
WO (1) WO2014141684A1 (de)

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WO2018168696A1 (ja) * 2017-03-17 2018-09-20 日本電気株式会社 光海底ケーブルシステムおよび光海底中継装置
JP7199034B2 (ja) * 2018-10-25 2023-01-05 パナソニックＩｐマネジメント株式会社 レーザ装置
JP7312956B2 (ja) * 2019-07-24 2023-07-24 パナソニックＩｐマネジメント株式会社 レーザ加工装置

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JPH043029A (ja) 1990-04-20 1992-01-08 Fujitsu Ltd 光増幅用ポンピング光源の駆動方法
JPH05235445A (ja) 1992-02-19 1993-09-10 Nippon Telegr & Teleph Corp <Ntt> 光ファイバ増幅器
JPH05268166A (ja) 1992-03-18 1993-10-15 Kokusai Denshin Denwa Co Ltd <Kdd> 光増幅中継回路
JPH05268186A (ja) 1992-03-09 1993-10-15 Nec Corp 通信制御装置
JPH05268167A (ja) 1992-03-19 1993-10-15 Mitsubishi Electric Corp 光中継装置
JPH08304860A (ja) 1995-05-11 1996-11-22 Kokusai Denshin Denwa Co Ltd <Kdd> 光ファイバ増幅器
JPH10284789A (ja) 1997-04-08 1998-10-23 Nec Corp レーザダイオード駆動回路
JP2000286755A (ja) 1999-03-31 2000-10-13 Mitsubishi Electric Corp 光増幅装置
US20050018726A1 (en) * 2002-03-02 2005-01-27 Rofin-Sinar Laser Gmbh Diode laser configuration with a plurality of diode lasers that are electrically connected in series
JP2006128382A (ja) 2004-10-28 2006-05-18 Mitsubishi Electric Corp 光増幅器
JP2011199079A (ja) 2010-03-20 2011-10-06 Fujikura Ltd 励起光源装置

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Publication number Priority date Publication date Assignee Title
JPH043029A (ja) 1990-04-20 1992-01-08 Fujitsu Ltd 光増幅用ポンピング光源の駆動方法
JPH05235445A (ja) 1992-02-19 1993-09-10 Nippon Telegr & Teleph Corp <Ntt> 光ファイバ増幅器
JPH05268186A (ja) 1992-03-09 1993-10-15 Nec Corp 通信制御装置
JPH05268166A (ja) 1992-03-18 1993-10-15 Kokusai Denshin Denwa Co Ltd <Kdd> 光増幅中継回路
JPH05268167A (ja) 1992-03-19 1993-10-15 Mitsubishi Electric Corp 光中継装置
JPH08304860A (ja) 1995-05-11 1996-11-22 Kokusai Denshin Denwa Co Ltd <Kdd> 光ファイバ増幅器
JPH10284789A (ja) 1997-04-08 1998-10-23 Nec Corp レーザダイオード駆動回路
JP2000286755A (ja) 1999-03-31 2000-10-13 Mitsubishi Electric Corp 光増幅装置
US6614588B1 (en) 1999-03-31 2003-09-02 Mitsubishi Denki Kabushiki Kaisha Optical amplifier having various control circuitry
US20030184850A1 (en) * 1999-03-31 2003-10-02 Mitsubishi Denki Kabushiki Kaisha Optical amplifier having various control circuitry
US20050018726A1 (en) * 2002-03-02 2005-01-27 Rofin-Sinar Laser Gmbh Diode laser configuration with a plurality of diode lasers that are electrically connected in series
JP2005530332A (ja) 2002-03-02 2005-10-06 ロフィン−ジナール レーザー ゲゼルシャフト ミット ベシュレンクテル ハフツング 複数のレーザダイオードを備えるレーザダイオード装置
JP2006128382A (ja) 2004-10-28 2006-05-18 Mitsubishi Electric Corp 光増幅器
JP2011199079A (ja) 2010-03-20 2011-10-06 Fujikura Ltd 励起光源装置

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Japanese Office Action mailed Aug. 16, 2016, by the Japanese Patent Office in counterpart Japanese Patent Application No. 2015-505288.

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Publication number Publication date
US20160028209A1 (en) 2016-01-28
EP2975705A1 (de) 2016-01-20
CN105051990B (zh) 2018-04-17
CN105051990A (zh) 2015-11-11
WO2014141684A1 (ja) 2014-09-18
JPWO2014141684A1 (ja) 2017-02-16
EP2975705A4 (de) 2016-11-16

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